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Commit ba45df4c authored by Anthony Koo's avatar Anthony Koo Committed by Alex Deucher
Browse files

drm/amd/display: Expose target backlight level 



[Why]
DM may want to understand any backlight optimizations
applied, so DM needs a way to query from the HW both
the real current backlight, which may be value during
transition.
And also target backlight, which may be after some
backlight optimizations applied.

[How]
Add interface to query current and target backlight levels
Target level may indicate backlight level after backlight
optimization and reductions are applied.

Signed-off-by: default avatarAnthony Koo <Anthony.Koo@amd.com>
Reviewed-by: default avatarKrunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: default avatarLeo Li <sunpeng.li@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent f41a8950

drivers/gpu/drm/amd/display/dc/dce/dce_abm.c

+12 −0
Original line number Diff line number Diff line
@@ -276,6 +276,17 @@ static unsigned int dce_abm_get_current_backlight(struct abm *abm) 
	return backlight;

}



static unsigned int dce_abm_get_target_backlight(struct abm *abm)

{

	struct dce_abm *abm_dce = TO_DCE_ABM(abm);

	unsigned int backlight = REG_READ(BL1_PWM_TARGET_ABM_LEVEL);



	/* return backlight in hardware format which is unsigned 17 bits, with

	 * 1 bit integer and 16 bit fractional

	 */

	return backlight;

}



static bool dce_abm_set_level(struct abm *abm, uint32_t level)

{

	struct dce_abm *abm_dce = TO_DCE_ABM(abm);
@@ -410,6 +421,7 @@ static const struct abm_funcs dce_funcs = { 
	.init_backlight = dce_abm_init_backlight,

	.set_backlight_level_pwm = dce_abm_set_backlight_level_pwm,

	.get_current_backlight = dce_abm_get_current_backlight,

	.get_target_backlight = dce_abm_get_target_backlight,

	.set_abm_immediate_disable = dce_abm_immediate_disable

};

drivers/gpu/drm/amd/display/dc/inc/hw/abm.h

+1 −0
Original line number Diff line number Diff line
@@ -58,6 +58,7 @@ struct abm_funcs { 
			bool use_smooth_brightness);



	unsigned int (*get_current_backlight)(struct abm *abm);

	unsigned int (*get_target_backlight)(struct abm *abm);

};



#endif